Pressure-gage.



H. M. BABIKIAN. PRESSURE GAGE.

APPLICATION FILED FEB.1

Patented July 17, 1917.

- HAIG M. BABKIAN, F EAST SYRACUSE, NEW YORK.

PRESSURE-GAGE.

To all whom z' may concern.'

Be it known that I. Haie M. .BmIKIANf a citizen of the United States of America,-

and resident of East Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Pressure-Gages. of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This vinvention relates to certain improvements in pressure gagesl for testing the air pressure in pneumatic tires, supply tanks therefor and analogous purposes. and in-l volves the use of a Bourdon tube and an i index finger actuated thereby around a suitable dial, all inclosed within a circular case with 'suitable means for attachment of the case to the container for the air, the pressure of which is to be tested.

These gages are subjected to more or less rough and careless handling, and in view of the fact that the pointer end vof the index linger is a considerable distance from its fulcrum, any slight variation in the position of the fulcrum would ca use a large discrepancy in the accuracy of reading the free end of the pointer on the dial. y

One of the main objects, therefore, of my present invention is to provide 'more efficient ineans'for holding the outer or front end of the spindle which supports the pointer against lateral displacement under the rough orcareless handlingl .referred to.

Another object is to increase the general efficiency of the entire gage, .particularly by providing the tubular inlet nipple, to which onel end of the Bourdon tube is secured.,

40 with an integral arm extending diametricallyv across "the inner face of and within the case. and partially held in place by countersunk bosses entering corresponding recesses in thel adjacent sides of the back and arm to alford a substantial supporting means for a bracket carrying theouter cnd of the pointer spindle and dial. so that the crank arm which is secured to the spindle and connected to the free end of the Hourdon tube may `belocated in the space between a portion of the bracket and arm.

Another object is to utilize` the bracket for supporting the dial wholly above the spindleI which car-ries the pointer.

Specicationof Letters Patent.

A still further object is to enable the Patented July 1 7, 191% Application mea February 1, 1917. serial no. 145,938.

parts to be assembled in sequence from the back forwardly after the tubular nipple with' the Bourdon-tube secured thereto has been placed in operative position, thereby greatly accelerating the work of assembling, and enabling the operator to properly adjust the parts as they are assembled.

Other objects and uses relating to specific parts of the device will be brought out in the following description.

In the drawingsv Figure l is a front elevation of a pressure gage embodying the features of my invent1on.

F ig. Q is an enlarged front elevation of the interior mechanism of the same gage, the case being shown in section.

Fig. 3 is an enlarged transverse vertical sectional view taken on line 3-43, Fig. l.

'el is a sectional view taken in the plane of line l-l, Fig. 3.

As illustrated. this gage comprises a sub'- stantially circular sheet metal casej-1 having a removable cover -'2- across its front side provided with axially extending lugs -3- overlying upon the periphery of the main body of the case and secured thereto by suitable fastening means, as

yscrews 1--, so that the cover may be readily removed when necessary by simply removing the screws.

The back of the case is provided with a pair of countersunk bosses 5 arranged in a dialnetrical plane passing through the center of a peripheral openin --for a' purpose hereinafter described, the front or cover section J2- being provided with a circumferentiallyelongated sight opening -T- across which is secured a transparent plate --S- to permit the reading on a dial .9- within the case.

. A tubular nipple -10 is secured within the peripheral opening 6* within the case and is provided with an integral arm llextending diametrically across the vinner face of the back of and within the case -lin line with the countersunk bosses -5- and, therefore. in the radial plane of the opening and is provided in its rear face with recesses -12- for receiving said bosses so that when the latter are registered with the Vrecesses they will aid in locking the back of the case v,and arm ll* to each other.

Time@ parts are. however, additionally se cured together by b'olts --lB- passing c through aperturesin the bosses 5- and engaging threaded apertures in the arm -l1'--, the heads ot' the bolts being wholly within the` counter-sunk portions of the bosses, thus leaving the back ofthe case substantially smooth, or rather free from projections beyond the plane thereof. .l

The nipple n410-- is provided with an inlet 14 having a branch 15, to which isV connected one end of a Bourdon tube 164- which is rigidly securedto the main body of the nipple so that it may be assembled thereon before the latter is inserted into the case.

A' plate or bracket 17e-is secured at one end by a screw 18- to the front face of the arm 1lsaid end being slotted longitudinally at n19- to permit slight radial adjustment of the plate or bracket,

to adapt it to receive one end of the spindle for the index finger, presently described.

The opposite or lower end of the plate or bracket -17- is spaced apart from, but parallel with, the front face of the arm -11- so as to overlie the same and is provided with a bearing *20- for receiving the adjacentendof a rock shaft or spindle Qlfcarrying the index finger -22- which is movable around the front face of Jrhe cl'ia,l7*"-9*.

The rear end of the spindle journaledain a suitable bearing 23*- on the arm -11 thus providing outer and inner bearings for opposite lends of the spindle to better support the same against lateral movement as it is rocked by the Bourdon tube.

Secured to the intermediate portion of the spindle within the space between the lower end of the bracket -17- and front face of the arm -11- is a crank arm -Q-lwhich is flexibly connected by al link -25- tovthe free end of the Bourdon tube 1G- so that any movement which may be imparted to said tube by air pressure therein will be transmitted to the rock shaft or spindle-Qland thence tothe index iinger Q2- for registering the pressure upon the dial '9 the latter being graduated in degrees per square inch of pressure.

Securing the crank arm -Qlto the intermediate portion ot' the spindle 2l between the bearings -20 and brings the application of the power necessary to turn lsaid spindle between the bearingsg'with they result that there is less liability ot springing the spindle than would -be the case it' the latter were journaled at o ne end .only and the turning jwwerapplied to apoint more remote from the journal bearing.

' This arrangement assures a. more permanent accuracy of reading and also materially placement in ease the instrument as a whole secured against the front face of the bracket -17- by means ot a screw 2?-, so that the plate is held in place by a single fastening screw and is spaced apart from the front or cover section-#2 to permit the free operation of the index nger -`22-' in said space. t

The hub of the pointer -22- 1s provided with a tapered socket frictionally fitted upon a tapered front end of the.

spindle -Qlso that it may be readily removed or adjusted when the cap or cover `-2 is removed.

In assembling the parts of this device, assuming that the cap or cover 2` is removed, the nipple -10 with the Bourdon tube secured thereto is inserted through v the open front of the'main body of the case at an angle to the axis thereof, in such manner that the nipple 10 will enter and pass through the peripheral opening 6- with the lower end of the arm --11- resting against the inner face of said periphery at one side of the opening.

lVhen the nipple land the Bourdon tube thereon have been thus placed, the arm -llwill lie atwise against the back of the case with its recesses -12- registering with their corresponding bosses -5-, whereupon the screws -13- may be secured in place to lock the nipple with the parts carried thereby in operative position.

The spindle --2lwith the crank arm -2lthereon is then placed in operative position with its rear end in the bearing -23-, whereupon the plate or bracket 17 is secured in operative position to thefront face of the arm -11 and its bearing -20- in engagement with the outer end of the spindle 21. L*

The dial plate -9- is then secured in place to the front face of the bracket -17-, after which the index finger #-22- is placed in operative position upon the outer end of the spindle -21- and the front cap or cover -9.-- is then secured in place to complete the gage.

If necessary a spacing sleeve -QS- may be placed over and .upon the outer end of the spindle -21- between the front face of xthe biacket.-l7- and hub ot' the pointer the dial is concentric with the spindle -21-4 and is suitablycalibrated or graduated in degrees lof pressure per square inch, the pointer being normally set at Zero against a suitable stop pin 30,- on the dial plate.

fhat I claim is:

1. In a pressure gage of the character described, the combination of a circular case having a radial opening in one side and inwardl)v projecting countersunk bossesin its back, a tubular nipple in said opening haring an integral arin extending diametrically across the inner face of the back of and within the case and provided Wit-h recesses for receiving said bosses, screws passing through apertures in said bosses and engaging said arm for securing the case and nipple to each other, a Bourdon tube secured at one end to the nipple, a bracket secured at one end to the inner end of said arm and having its opposite end spaced apart therefrom, a spindle extending across said space and having one end journaled in the bracket and the other end jourualed in the arm, a crank arm secured to the intermediate portion ofthe spindle Within said space, a link connect-ing the crank arm with the free end of the tube, a dial plate secured to the bracket, and an index finger secured to thespindle to turn therewith about the dial.

In apressure gage ot' the character de,- scribed, the combination of a ease, an air inlet nipple having an arm extending diametricall)v across the inner face of the back of the case and secured thereto, a Bourdon tube haring one end secured to the nipple and communicating with the passage therein, a bracket having its upper end secured t0 the front face of said arm and its lower end spaced apart therefrom, coaxial bearings 1n the lower end 0i the bracket and adjacent portion of the arni, a spindle extending across the space and journaled in said bearings, a crank arm secured to the spindle to turn in said space, connections between the free end of the Bourdon tube and crank arm, a dial secured to the fronti'ace of the bracket wholly above the spindle, and a. pointer mounted on the front end ot' the spindle to turn therewith about the dial.

In Witness whereof I hare hereunto set my hand this 23d da3v of January, 1917.

HAIG M. BABIKIX.

- IVitnesses:

II. E. CHASE, ALICE M. CANNON.

Copies of this patent may be obtained for ve cents eac-h, by addressing the Commissioner of Patents, Washington, D. C. 

